Fix grammar in Submission.sticky docstring

(cherry picked from commit praw-dev/praw@c3e7092)

asyncpraw/models/reddit/submission.py

@@ -274,7 +274,7 @@ async def sticky(self, state: bool = True, bottom: bool = True):
         .. note::
 
             When a submission is stickied two or more times, the Reddit API responds
-            with a 409 error that is raises as a ``Conflict`` by asyncprawcore. The
+            with a 409 error that is raised as a ``Conflict`` by asyncprawcore. This
             method suppresses these ``Conflict`` errors.
 
         This submission will replace the second stickied submission if one exists.